threading SoundOut/Wait and TextDisplay objects

[Becky Prince]

Many thanks Paul and David for the replies!  I'll see if I can manage
the display timeouts within the SoundOut/Wait loop as you've both
suggested.  If I find some genius/elegant solution to this problem
then I'll be sure to post it here.

Best,
Becky

On Jul 26, 9:51 pm, Paul Groot <pfc.gr... at gmail.com> wrote:
> Hi Becky,
>
> I also don't think E-Basic has build-in support for running separate
> threads. The only way I could achieve this was by creating a separate
> DLL in C++ and call it from inline script. (I needed it for
> controlling infusions pumps, which were used for fluid delivery during
> an fMRI experiment). However, code in a separate DLL cannot make use
> of E-Prime functions, so that really limits its use.  I think David
> already suggested the easiest workaround: just create your own event
> loop and handle all events (responses, timeouts) within this loop. I
> think you already figured out how to manage sound objects and
> responses. Drawing text or images on the display is also not very
> difficult. You could invoke 'low level' functions by using the Canvas
> object, or you could (re)draw existing E-Objects by invoking the Draw
> method. Catching the respones of the keyboard will probably the
> trickiest part...
>
> cheers
> Paul
>
> 2011/7/25 David McFarlane <mcfar... at msu.edu>:
>
> > Becky,
>
> > Stock reminder:  1) I do not work for PST.  2) PST's trained staff takes any
> > and all questions athttp://support.pstnet.com/e%2Dprime/support/login.asp,
> > and they strive to respond to all requests in 24-48 hours -- this is pretty
> > much their substitute for proper documentation, so make full use of it.  3)
> > If you do get an answer from PST Web Support, please extend the courtesy of
> > posting their reply back here for the sake of others.
>
> > That said, here is my take...
>
> > Offhand, I do not think that E-Prime natively supports multiple "threads"
> > such as you would like for this task, but I hope somebody else chimes in and
> > tells me that I am wrong.
>
> > Again offhand, I think you could accomplish your end by implementing your
> > own "event loop" directly in E-Basic code.  Do a search on that term to see
> > where I have mentioned this before, although I don't think I have ever gone
> > into much detail.  Wikipedia might have a better discussion of the topic in
> > general.  In your case your event loop would handle both timeout for your
> > TextDisplay, and responses.
>
> > -- David McFarlane, Professional Faultfinder
>
> >> Can anyone tell me how to set up multiple threads in E-Prime?  I need
> >> separate threads for running SoundOut/Wait objects and a TextDisplay
> >> object.  I'm creating a task which presents a continous loop of the
> >> following:
>
> >> -SoundOut1
> >> -Wait1
> >> -SoundOut2
> >> -Wait2
>
> >> The subject adjusts the timing of Wait1 and Wait2 using key responses,
> >> and the loop (trial) ends when the subject presses Enter.  I'm using
> >> InLine scripts after each sound/wait object to check for any response
> >> and adjust the next wait timing accordingly.
>
> >> The problem is that I'm also presenting a TextDisplay with background/
> >> default text, and I want to change this text display (to provide
> >> visual feedback) for 200 ms after a response, then have theTextDisplay
> >> return to the default text.  I can change the TextDisplay after any
> >> response, but if I tell E-Prime to wait 200ms, then change the text
> >> again, it introduces a 200ms delay in my contionous audio/wait loop.
> >> The timing delay problem is resolved if I just set the TextDisplay
> >> object to "clear after = No", but then the response feedback display
> >> text is held on screen until the next response, which is
> >> problematic.
>
> >> Any thoughts and suggestions are much appreciated!
>
> >> Becky
>
> >> p.s. Apologies if this has been addressed in E-Prime support/forums
> >> already - I've searched for related topics but couldn't find a
> >> solution.
>
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